10/8/2023 0 Comments Portable mining dredge![]() ![]() C22B3/00- Extraction of metal compounds from ores or concentrates by wet processes. ![]() C22B- PRODUCTION AND REFINING OF METALS PRETREATMENT OF RAW MATERIALS.C22- METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FERROUS METALS.suction dredgers wherein at least a part of the soil-shifting equipment is handheld ![]()
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